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Immune status of laying chickens
The gut and its inhabiting microorganisms play a vital role in shaping the body defense system in poultry (Diarra et al. 2011). Yeast cell wall products (chitin, mannan, and glucan) are known to stimulate the gut defense systems, increase immunoglobulin levels (Abaza et al. 2008), and white blood cell count (Abdollahi et al. 2002). The immune (Toms and Powrie, 2001; Cotter et al., 2002) stimulation potential of yeast products in breeders and laying hens have been reported. Kabir et al. (2004) and Maziar et al. (2007) investigated the influence of yeast on the body defense system of chickens and observed increased antibody production (p

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